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The portion marked in bold shows the effective code that was inserted due to SofteningTestAspect . As you see, the RemoteException is now caught by the main() method, which throws a SoftException wrapping the caught exception. Since the SoftException is an unchecked exception, main() no longer needs to declare that it can throw it.

If you use styles frequently, you can add the Style dropdown to one of your toolbars: 1. Choose Tools Customize. 2. On the Commands tab, select the Format Category. 3. Drag the Style dropdown to one of your existing toolbars, and click the Close button.

Now, instead of the aspect in listing 4.20, let s apply the following aspect (which softens the exception at an execution pointcut rather than a call pointcut) to the original TestSoftening class:

Summary

public aspect SofteningTestAspect { declare soft : RemoteException : execution(void TestSoftening.perform()); }

I presented in this chapter the internal database query execution operations. You learned how to expand the concept of the query tree to incorporate a query execution engine that uses the tree structure in the execution process. The knowledge of these technologies should provide you with a greater understanding of the DBXP engine and how it can be used to study database technologies in more depth. You ve reached the end of the book and may be wondering what else there is to do. This part of the book has provided you with an experimental engine based in MySQL that will allow you to explore your own implementation of the internal database technologies. Best of all, you can tweak the DBXP code any way you wish. Perhaps you just want to experiment, but you may also want to implement the union and intersect operations, or just expand the DBXP engine to implement the full set of query features in MySQL. Whatever you choose to do with what you have learned from this section of the book, you can always amaze your friends and coworkers by implementing an alternative query engine for MySQL!

By default, error values are displayed in a pivot table. You can hide the errors by changing the pivot table options: 1. Right-click a cell in the pivot table. 2. Choose Table Options. 3. To turn on the For error values, show option, add a checkmark in the check box. 4. Leave the text box blank, and the errors will be replaced with blank cells.

Compiling this aspect with the TestSoftening class will result in woven code that looks like this:

The following lists several areas for further exploration. They represent the types of activities you might want to conduct as experiments (or as a class assignment) to explore relational database technologies. 1. Complete the code for the do_join() method to support all of the join types supported in MySQL. Hint: You need to be able to identify the type of join before you begin optimization. Look to the parser for details. 2. Examine the code for the check_rewind() method in the Query_tree class. Change the implementation to use temporary tables to avoid high memory usage when joining large tables. 3. Evaluate the performance of the DBXP query engine. Run multiple test runs and record execution times. Compare these results to the same queries using the native MySQL query engine. How does the DBXP engine compare to MySQL 4. Why is the remove duplicates operation not necessary for the intersect operation Are there any conditions where this is false If so, what are they 5. (advanced) MySQL does not currently support a cross-product or intersect operation (as defined by Date). Change the MySQL parser to recognize these new keywords and process queries like SELECT * FROM A CROSS B and SELECT * FROM A INTERSECT B and add these functions to the execution engine. Hint: See the do_join() method. 6. (advanced) Form a more complete list of test queries and examine the limitations of the DBXP engine. What modifications are necessary to broaden the capabilities of the DBXP engine

Note This setting only affects cells in the data area of the pivot table. If there are error values in the

import java.rmi.RemoteException; public class TestSoftening { public static void main(String[] args) { TestSoftening test = new TestSoftening(); test.perform(); } public void perform() throws RemoteException { try { throw new RemoteException(); } catch (RemoteException ex) { throw new SoftException(ex); } } }

his appendix contains a consolidated list of the references used in this book, along with a description of the sample database used in the examples and some helpful hints on how to solve the chapter exercises for s 10 12.